1 - Electricity, which was studied for hundreds of years before being put to good use. Powers our houses and devices since the 19th century.

2 - Personal Computers. They're about 70 years old now, and their CPU power and user friendliness have increased dramatically.

3 - GPS, which was launched by the U.S. Department of Defense in 1973. It was used for military purposes in the beginning, but then a lower precision version of the system has been made available for civilians as well.

4 - The Internet as we know it took off in the 90s. Yes, it's that young!

5 - Cellular phones. The first commercially available cell phone was the DynaTAC 8000x. Sold in 1983, it had enough battery juice to last for 30 minutes of talk time, and its price was $3,995 (the equivalent of $10,000 in today's money).

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